Notice: Hosttitb automatically creates an SPF record for all shared and reseller customers.
If you are getting tons of spam return-messages (like Failure Notification or Mailer Daemon)...THIS IS SPOOF
Partial solution: Enable Default Address and set every catchall to :fail: no such address here. This will stop you from getting the bounce-backs, but the real problem is not solved.
Full solution: You need to create an SPF record. An SPF record is an entry added to the DNS zones for a domain. This record verifies that a user has permission to send mail from that domain. This is used to prevent spoofing for your domain. You may contact us to be sure you have a working SPF record.
You can check for your own SPF record at nwtools.com by selecting the DNS Records search and submitting your domain name. Then look for a TXT record with "v=spf1 ..." as the value.
You also need to know...
SPF records only work if your mail service bothers to authenticate outgoing emails.
Anyone who uses a mail server which does not respect SPF record will be able to send spoof emails. Currently, the SPF record is widely used by popular hosting and email companies. (Especially Hosttitb, Google/Gmail, Yahoo, Hotmail, etc.)
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